It is false that some entrance exams are not occasions for panic. Therefore, some entrance exams are occasions for panic.
A) Invalid, illicit subalternation.
B) Valid.
C) Invalid, illicit subcontrary.
D) Invalid, illicit contrary.
E) Invalid, illicit contraposition.

Question

Quizplus · Accepted Answer

This is a straightforward application of the principle of contraposition. The original statement can be rewritten in the form "If an entrance exam is not an occasion for panic, then it is false." By contraposition, we get "If an entrance exam is not false, then it is an occasion for panic." Therefore, we can conclude that some entrance exams are occasions for panic.

It Is False That Some Entrance Exams Are Not Occasions